PEROMYSCUS. 181 
Geogr. Distr. State of Oaxaca, Mexico; range unknown, 
Genl. Char. Size small; similar to Mus musculus. 
Color. Above drab gray, sides brownish; sides of nose, lips, under 
parts, hands, and feet white; tail brownish above, white beneath. 
Measurements. Total length, 187; tail vertebra, 88; hind foot, 2.5. 
136. cozumelz (Peromyscus), Merr., Proc. Biol. Soc. Wash., xiv, 
foc? D. 103: 
ISLAND OF CozUMEL MOUSE. 
Type locality. Island of Cozumel, Yucatan, Mexico, 
Genl. Char. Size medium; ears large; similar to P. afjinis. 
Color. Above from grayish to fulvous brown; beneath white; 
tail brownish dusky above, whitish beneath; wrists and ankles dusky ; 
hands and feet whitish. 
Measurements. Total length, 180; tail vertebra, 80; hind foot, 23. 
137. geronimensis (Peromyscus), Allen, Bull. Amer. Mus. Nat. Hist., 
T8098, p. 150. 
SAN GERONIMO IsLAND FIELD Mouse. 
Type locality. San Geronimo Island, Lower California, Mexico. 
Geogr. Distr. Lower California, Mexico; Island form. 
Genl. Char. Similar to P. texensis; size larger. 
Color. Above fulvous brown and black, darker dorsal band per- 
ceptible; sides pale fulvous; under parts white; tail above dusky, 
sides beneath whitish. 
Measurements. Total length, 175; tail vertebra, 83; hind foot, 
20. Skull: total length, 25; basal length, 21; mastoid breadth, 11, 
interorbital constriction, 3.8; length of nasals, 8. (ex Type.) 
138. dubius (Peromyscus), Allen, Bull. Amer. Mus. Nat. Hist., 1898, 
pi 157. 
Topos Santos Istanp Mouse. 
Type locality. Todos Santos Island, Lower California, Mexico. 
Geogr. Distr. Lower California, Mexico. 
Genl. Char. Size rather large; color dark. 
Color. Above grayish fulvous brown, and black; sides fulvous; 
lateral line brownish fulvous; under parts white; hands and feet 
whitish; tail, basal third blackish brown, sides and beneath whitish. 
Measurements. Total length, 175; tail vertebra, 82; hind foot, 
18. Skull: total length, 26; basal length, 21.5; zygomatic breadth, 
12; mastoid breadth, 11; interorbital constriction, 3.5; length of 
nasals, 9.5. (ex Type.) 
lewcopus sonoriensis (Hesperomys), Le Conte, Proc. Acad. Nat. 
polen. Fnil,, 1853, p. 413. 
